Check valve



Patented May 27, 1924.

U N 1T E JOHN A. LE CAIN, OF MALDEN, MASSACHUSETTS, ASSIGNOR TO WORTHINGTQN PUMP AND MACHINERY CORPORATION,

CHECK Application filed December 1 0 all whom it may concern Be it known that I, JOHN A. LE CAIN, a citizen of the United States, residing at Malden, county of Middlesex, and State of Massachusetts, have invented certain new and useful Improvements in Check Valves, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to improvements in automatic check valves of that type cushioned on their opening movement to avoid pounding, the invention being especially applicable to exhaust check valves for use in feed water heaters and the like, although applicable generally where such a cushioned check valve is of use.

One object of this invention is to provide a cheap, compact and efficient check valve having means for regulating or adjusting the cushion.

A further object is to provide an improved and efficient device for cushioning the movement of such valves in both directions.

In the accompanying drawings forming a part of this specification, the invent-ion is shown as applied in preferred forms, and these constructions will now be described in detail and the features forming the invention then specifically pointed out in the claims.

In the drawings,

Fig. 1 is a vertical section showing an exhaust check valve of the preferred form embodying the invention in its most complete form;

Fig. 2 is a similar view showing a moditied construction with cushioning in only one direction.

Referring to the drawings, the valve casing is provided with branches 11 and 12, the branch 11 being normally the inlet branch, and branch 12 the outlet branch to the heater. The upper end of the casing 10 is closed by a suitable cap 13. The valve seat 14 is secured in any manner in valve deck '15 and carries through suitable webbing a central hub 16 having its center cored out as shown. A suitable valve 17. preferably of the plate type, coacts with the valve seat 14, and is provided with a central opening through which passes a valve guide 18.

To cushion the opening movement of the valve 17 I provide a cushion chamber 19 A coaroaamron or VIRGINIA.

VALVE,

22, 1920. Serial No. 432,398.

above the valve and preferably cast integral- 1y with the cap 13 and an extension 20 thereon. An important feature of the invention comprises the provision of means for adjusting or regulating the effective size of the cushion chamber 19 to control the cushioning of the valve 17 This .regulating means may advantageously be of the form shown in which I provide a regulating disk .or plate 21 within the cushion chamber 19.- The disk 21 is secured between nut 22 and a shoulder, forming, as shown, the end of the valve guide 18, on a stud or bolt 28 screw-threaded in the extension 20 for adjustment. A suitable lock nut 24 may be provided for locking the disk 21 in its adjusted position. The invention as thus tar described embodies a flow from passage 11 to passage 12 as shown by the arrows in Fig. 2. 1

A further feature comprises means whereby the valve may be used with flow in the opposite direction or in normal use a portion of any temporary back flow is directed against the lower side of the valve to aid in holding the valve open and to cushion its closing movement. Referring particularly to Fig. 1, the valve seat 14 is formed with a portion projecting well above the valve deck 15 and provided with a suitable number of side' ports 1 connecting passage 12 with passages 2 which open at the upper edge of the valve seat 14 and form ports closed by the valve 17. The through port in the valve seat is preferably divided by one or more annular partitions 3 so that the steam passing through passage 2 against the valve flows inwardtoward the center of the valve for delivery through the seat to passage 11 which increases the lifting and cushioning effect on the valve. By this means a portion of the back flow as shown by the arrows in Fig. 1 is directed upward against the valve in its seating movement, thus aiding in keeping it open and effectively cushioning its seating. If the valve be used for a reverse flow, that is, from branch 12 to branch 11, the flow through ports 1 and passages 2 will open the valve, thus allowing flow to the through port connecting with branch 11.

By means of the regulating disk the effective cushioning of the valve may easily be regulated to meet the conditions of the service in which it is used. This device has the further advantage that the regulating disk may be screwed down to force and hold the valve down against its seat so as to act a shut 01f valve.

It will be understood that the invention is not limited to the construction shown and described as various modifications may be made therein Within the invention as defined by the claims.

What is claimed is:

1. A check valve having a valve seat, a valve coacting with the seat, a cushion chamber for the valve, and aregulating plate movable to adjust the cushion chamher.

2. The combination with a valve seat and valve, of passages for directing a portion of the back flow against the valve in a direction tending to open the valve whereby the closing movement of the valve is cushioned.

The combination with a valve casing and valve seat, of a valve coacting with the valve seat, and ports and passages formed in the valve seat for directing a portion of the back flow against the valve to cushion the closing movement of the valve.

-'ll:. The combination With a valve casing and valve seat, of a valve, a cushion for the opening movement of the valve, and passages for directing a portion of the back flow against the valve to cushion the closing movement of the valve.

5. A check valve having a cushion chamber for cushioning the opening movement of the valve, and valve seat 1st having a through port for flow in one direction, and ports 1 and passages 2 for directing flow in the opposite direction against the valve in a direction tendingto open it.

6. A check valve comprising valve seat 1a having a through port for floW in one direction and ports 1 and passages 2 Within the valve seat for directing flow in the opposite direction against the valve in a direction tending to open it.

7. A check valve comprising valve seat 14 having a through port for flow in one direction, annular partition 3 dividing said port, and ports 1 and passages 2 for directing flow in the opposite direction against the valve in a direction tending to open it.

8. A check valve having valve disk 17, cushion chamber 19, disk 21 in said chamber, and adjusting bolt 23 carrying the disk and having a valve guide extension.

In testimony whereof, I have hereunto set my hand.

' JOHN A. LE CAIN. 

